SqlThrowOperator (Apache Calcite API)

java.lang.Object
- org.apache.calcite.sql.SqlOperator
- - org.apache.calcite.sql.SqlSpecialOperator
  - - org.apache.calcite.sql.fun.SqlThrowOperator

```
public class SqlThrowOperator
extends SqlSpecialOperator
```
An internal operator that throws an exception.
The exception is thrown with a (localized) error message which is the only input parameter to the operator.

The return type is defined as a BOOLEAN to facilitate the use of it in constructs such as the following:

CASE WHEN <conditionn> THEN true ELSE throw("what's wrong with you man?") END

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.calcite.sql.SqlSpecialOperator
  SqlSpecialOperator.ReduceResult, SqlSpecialOperator.TokenSequence

Field Summary
- Fields inherited from class org.apache.calcite.sql.SqlOperator
  kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors
Constructor Description

SqlThrowOperator()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`unparse(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec)`	Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.

Methods inherited from class org.apache.calcite.sql.SqlSpecialOperator
getSyntax, reduceExpr

Methods inherited from class org.apache.calcite.sql.SqlOperator
acceptCall, acceptCall, adjustType, allowsFraming, argumentMustBeScalar, checkOperandCount, checkOperandTypes, constructArgNameList, constructArgTypeList, constructOperandList, createCall, createCall, createCall, createCall, deriveType, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getMonotonicity, getName, getNameAsId, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, leftPrec, preValidateCall, requiresDecimalExpansion, requiresOrder, requiresOver, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateCall, validateOperands, validRexOperands

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - SqlThrowOperator
```
public SqlThrowOperator()
```
- Method Detail
  - unparse
```
public void unparse(SqlWriter writer,
                    SqlCall call,
                    int leftPrec,
                    int rightPrec)
```
    Description copied from class: SqlOperator
    
    Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.
    The default implementation of this method delegates to SqlSyntax.unparse(org.apache.calcite.sql.SqlWriter, org.apache.calcite.sql.SqlOperator, org.apache.calcite.sql.SqlCall, int, int).
    
    Overrides:
    
    unparse in class SqlOperator